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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39ee6696941c983cd4647339d462cb4d0fe51ff457d51db450cd97b3c2c07b42' 
  AND token = 'nz0X7BMtiRb4pBZLCeqlo02hSlFktMMnfpoYQ1qoJ9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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