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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '178e0ba976f0ba6fda376a13e8e74558ef7cb2d928a28ed026c03a641a54a03e' 
  AND token = '9lvnamm1iZCQ42Baqdc9hEGVlFyLR18S/UZWvBmksII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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