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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c4090ebf9c86b949959d99b4489d58a720d3b2c904040f98f56f0dca0f95fcb' 
  AND token = 'YHE11OX9k6eGUFN9qGesuEJWH1tghiAEl2iL9IEveLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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