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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c07007b989e09c9ae29e22a93d7446a8b8df2bdca150420923d49ea732c9d4fa' 
  AND token = 'QR9/b/wCjHPAnI9tVP6tKh1mfe3tRWOpsuG6Yhuy/LM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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