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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '234e4bff0bca833543f440c66b730e12cc3084d2ae263463f58c4f5d8af0353c' 
  AND token = 'i1h9+ibrHujixuWhbfuV0c+a1s5PC3WkoEPQv5vly5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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