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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58a7de6f0486391805754ce515875e08b8b4c8636447d25857e0b13649037e4b' 
  AND token = 'bGirjUVmI/bkOksEEp0m1WfZgbcyAVyzlPE0JPea2tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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