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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4171cf6c99f00e28afbecf43a3fa5aa0af1dac05a0d8644e83d596115f0f02f6' 
  AND token = 'Vl7p6Z/hX2BgxbvmP8rZaRDjRGnSCGaMR5TeOVcnstI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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