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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c2a3834bc94a1f56deb4704f0cc2ac09b955e284a79250476f133635357d9c8' 
  AND token = 'chRHkdfQ4xXsKJM2M31eL8KQO/VLy4eF3xDB1Y+ASEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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