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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '379e1af907093e2851ae809aa6171b0fd96e517671a8a7d2ad1508b29c99d2a6' 
  AND token = 'Z/A7KSOtWRlwEU87iCbGQ/4TRepYh+1KCoct1821TSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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