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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f0d48595c8669390e55c92ea2d5f1d57ce3f4b95bf696711f27dcbde3d3f02b' 
  AND token = 'QNJ8a6nvel6hM/2zEDfhNKg3avYTo+8ybWm1+ha9mRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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