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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df92adea47b1edb144cab1e8c190952a7ee91d847fe71624f6b4699d69f18e8a' 
  AND token = 'zaYc70vzQuDXri/JW5DewrctyClqibZ5h8IW/8vBDwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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