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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fea054a2594c7ac9947d1e3d6e032880ccebb7abb32147c58ab65591b129da0' 
  AND token = 'ybweXQJ1o5kqUAqetbfvk8hZc1RZl7+x0ex5tm72nvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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