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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eb4e2e9d5149e9f28ad44466e88ae59f5fa3af88d92dc6c100493d6705162c6' 
  AND token = 'U25NerXiavhrOjAIYR4+e+6+Lhs/XgwjAxgLOYTbcls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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