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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea2e0b8c5928c82f8e99eee5a3ff1d5bfaa1ad5c0cf7d739991138a9b421cf14' 
  AND token = 'pwSXW3IBk4MQyy4wfuFNBoRAGkNtFZCf2/HiQxSVeQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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