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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c57ebdf2b001bec1d2448d335113c8f77f570f5ead29f5e829bb97d1262d3b5c' 
  AND token = 'XZGT8XkrAiCqXfrvqpcAUnQWYLG38Sai7YBcicFwTSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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