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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd212196b0a00ad1ec9728bc2abadd7e7b9bebd73fc407f2c219b6c0de80f659e' 
  AND token = '09WRzzqR+c1eUphvHtjWkOynOHMW9kNnADHVqSZV9+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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