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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adacddd93a078b0d7f13c8757e7da75659844c968715341ca5a0959689da40af' 
  AND token = '5+IH/vlKmkCk3xg3KAIkLExh2nt9JrloET/J17By+ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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