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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2776d9c0cfc2606a41f874d05628a130a888a5e410a71888f348e27c64807ef3' 
  AND token = 'KgmUbq2rRGSKgjycKzsoKg4yfwzVRsdYQJGdFrm5q8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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