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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6e5819ce4ef0048aef0202ddd67b2ea69cb4880d789d811c4cae25ce548e4fd' 
  AND token = 'tf9x+R7nBUsXXu/vlz3Y51BhG0ltUdbdKGj95nG1FnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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