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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70cc3b801460319eb0fccd78ccb218d53996039709cf188c356c0993d950df62' 
  AND token = 'clktmbBbdW6YRLq0E8irUPT72uVwBqVIMVYru9etTns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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