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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9756cc8a07b040f7376a2b7b3d25756d22c899c73b26dc2462e0c8bc793865ef' 
  AND token = 'X2St4AMg45Zr+eC7YhxrGaQAXE/oJHUXPehUU+W3sO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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