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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1c40501132ea963c49c6cf9fec0e47337aacc04905ef09d8b9046e2c266faf1' 
  AND token = 'd69zFT4rDFZ4vylH5LlYXB2dXiZcHJ83fnbkpYgDfvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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