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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '571b80e39b25b965bb5011e8c73a5def347c92b2ba81e2775ef81b4bcca37621' 
  AND token = 'kI2O0BPYmcPtMAd41/n+q7MXF8NTlF+ttbN+CtAbmx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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