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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5897d7277d1d499c631e9d41d0d17f31c1e932609292845206f8523cb056ba5a' 
  AND token = 'T/7rfkfvJxj1/7BHKKzVmH+QwbkTY5Iaeymc61lMTeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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