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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0f142ada350c2089e5a69e5fa5de7c9cc56c514c2a45c33099e7617e93fd41a' 
  AND token = 'Q1naPOIEvKboec5Q1j7O5J8ZLsFBsdGDxsF7LvsPaRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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