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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71c10b3723b8fe23b5041dcceae599e7f1dfa287c3b3fc500a0981b0dfc84482' 
  AND token = '2i6KOyogMSJO2diiygcivp1aNV2M/9gMG96f3yR0AWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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