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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e99965b47f39c3c90bfd5f40f4404fe8dea144299f27aa68ba92dac001bccd7f' 
  AND token = 'eLs4Uo7eP3fGttgaZseoPvU5COF5ageNmjCHQJBACcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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