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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adfdc63647a4971f71a0b32be7c0a3759d01174edc38a3a6364baacae917f236' 
  AND token = '9XG7syO9zpgcAEiEPUTNfY7blDyPedpP4w2XGmFlVTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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