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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '162ddb7894b8ac76d6572cddbf93005a193827cdae99a86f0899556c8fa10ea2' 
  AND token = '0bdTA0VVIQwX2ZdLH88W958vWumZJIp5oCmoa0F5AF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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