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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90b226afb4a28b83a9587b81c46e10c17c961e3f1e9866664ec89896d6f1076e' 
  AND token = 'zw5hCwNZJTVM90At3ZusFivvY3R7sHGUR3Hnkp9ekGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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