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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '043843ce64cce6f4c80e6b3ae80b57902d2a0cccf5dd771e0544b2d622a7668f' 
  AND token = 'rAqS1nvDcgCo2UfcgKo2pV75kGyjurnVS0DM3beJyIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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