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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dc64af4209a64abd9ce666a73d8c692c3e519efc2160cba564ed8d930c9325f' 
  AND token = 'msEUbZ2rHlkEEEO9/O/KQPyn25ySpRZSqZQsm+ksz9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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