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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa3d13797a0255d094104fa7e6911f54264429b1f5ac640fac5f645585ce6a23' 
  AND token = '7x7kjmGd1pkMurAuHPr515YzjHELcaS2CG4jmH7URtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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