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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82e95ca3b4b55f5c0381fd6c906989f9a7e2c173adde9645f87ccb6ce3a26279' 
  AND token = 's2PuIFjsxHZtpgfymN9VVDZ+udUdjI4gNwEx90QMAVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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