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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff688dabe675f8886dedf763bcf75b3e7916e582029f4532ecb8fcd2b5af4484' 
  AND token = '3s6CucZT4Dh34S1EcFsRPogTy3x8GuC1UfAGGIOaSL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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