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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7905bff9b00ba9cc846e6634dfa6feb3a6ab7fd2e4b6cb86d153a162a580ccc7' 
  AND token = 'm4EpH6kQDpFB+30eb6EvBF74lpla73nQM7eBFru23mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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