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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '691a8b7aa087b4c81a6d7216db2ffeb009706f867574886fe40779d0693e7e19' 
  AND token = '1jvy0F7a+k/2D0qSJgKQ2F2CYE+Lc4VexD6m/1VbrAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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