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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8bfcee847741d5612ea46678abe93b760bd8dd0d2f62983e60ba4c88ca927a9' 
  AND token = 'B+GbtgIkT/9G/soAGByEHgjTwyccfy6z4TLPDS58n/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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