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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21ded29f298db5080ed9483ff1fbdd360fa63bd75f413f05f419d7c77314c54d' 
  AND token = 'SMUMPi2xe1vL2O4pR8X3hTu0hVMJU8oM21MwISUvvtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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