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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d8fd87bba33c17dca833cb90c2b1a5aef3f943a796ed14bff1714b165ad2e87' 
  AND token = '59gRvzWqhSS4s0HF4ClCmE77AV2/EjGzmveIV5CSXnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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