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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75cc43793a96b4521edcd9743e44f542afd782aa809fefa6ea8391098dca94ef' 
  AND token = 'VYU1Ez6UGMX12rqJr4G686ffPAxBLLLUX2hVMQ0s9qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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