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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad992a4defc4a3d73f336b5b3cf65a2757c4e0e54c38468c3f43cb45cfc3cbed' 
  AND token = 'wAsBlf/dHhdTFo3cNmBrk3PYtDSFo8h4Yair5UgN52s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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