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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5704b4cbbda9edb39580ad5d13ae13e1c8e60a72ece98fb2a1ce8f18ec49cb08' 
  AND token = '/0rRaeY34Oa5X+xXJdi5wE4gY3gBYy2K3ExxJXsV1vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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