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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d1a11fb5247a47fe5d35892a2dfad6b9c0a3fd93c7862ceb41376df5bc0ec8a' 
  AND token = '6c3Q3wNvPQ6tC0Z0SPRjeJ8M/UGQL/oxKNWtBOOkE8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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