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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6c17b437620446562a0b14a5cd0aaad4f44ec52f606866f1ff3d5eed5ef6b31' 
  AND token = 'n0jQ4FMUtNGDJYm5GesYPYZQePIxsUyA6B1BCFmzEXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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