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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '233e0710cc48e730e09a8aa50fe15cd3a8d673224ff0a2da2735c6f7b274ebd0' 
  AND token = '8lLtuGqu/MMnHH+nmEyHQvGg0ssEnnqZ08yCqpf7Cys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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