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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e47f6d56bfb90e402523201cc6249b922bfa790a6de949c6ad4b350ba51947ad' 
  AND token = 'RaEMhvALe3NxuQO2noMZhQ3l8rH/WKxJcvLd8DGACnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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