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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b11ffabe135f6944e0c849061221e1abb9ac5a837018d23e28dad0d856071912' 
  AND token = 'mBF5Tui2PxvMUHrSd1yPenBGeBstvnp3afLSSBzJnwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}