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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9e7133b1ae51d248a0f7ff048f4ae3c6ab2dfd28fe155eb966223d739d991d9' 
  AND token = 'NHFK41SCAEQ54iPoVKETMS5FQW3eLXtnrXj2+o1KOw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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