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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f9abdbee849f10a70140cd24906b5ef3103d5c53e64d1a9dd091607b176a92c' 
  AND token = 'gDVH/yNOpurv4WKXgWYZyi6x4++mKc5s9FMabhU2DE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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