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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c478aa3b89acce9d3b585c242af4903c1b71eff8bb310792cf5cb01b114621f4' 
  AND token = 'V6o2lWoOr/zDf4qBF3DwESpkUPMkwVwbkh40QUN37nU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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