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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2f4a764864f25dd90cd84a708851f6fd375ed93ffd6bea03b0414f98252200b' 
  AND token = 'b9sj/O9XSHq8ArW46TgUCo5PfPRCBV6Ac7ygJYdba5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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