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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3b4d3c616dbb719d5e4968f42c7b7882f4ac60ea4b7463692f016c6f8a43901' 
  AND token = '9EAitE6B/dD9tMoMzP/kOcB3SBNLrQJfWvL8F+Ed8gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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