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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02c5ed4eaa2ada9384a8e82192af49cd390f7b54b06275c6f84a58711c042fd5' 
  AND token = 'ht6KQCsCoyqBndNZ7W0bveFGDbSXRTC+neS8fCv/4l0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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