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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '840b54564473ca3c11fb139afa8aca9a0e1050e16d99b1dede3f48e6ec6aa4bf' 
  AND token = 'cH7byXNkZ4zh0+77aPMdCfyccT7t+otICtof35MhrPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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