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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '119092cf94721474e80f25adc8dd79197a13976fe16016bcc150b5ffc1c2ef6b' 
  AND token = 'xBhi8bZioPrlQ9GNA8vmKanJGa2YcwL4V1UHfo6XRPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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