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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9520128acc002ad0518233c06e319c6fdc2237b8e619e84c1425f99957854f42' 
  AND token = '9aFEouMGx8+TYmHScl1YRRhIQ4x56y3VIZCT9u1y28M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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