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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2425c43eab3177266d21b4cde16506830f653a760ba42e8198e2f8a42bf30b1' 
  AND token = '/pTkImP1lfmb4vQ5r8MRRtqDk6K4xT5O+D+Q2gzVrpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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