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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dbae5ae3c6b4294676db13230f0d975e3389ff8d991e75fdeb97a64ccde770a' 
  AND token = 'xWhWYeirY6BF2zERlxz93c9l/davTg5rBd26RDOLnBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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