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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '973746458af89faffbba7a9b59e1b54047605c4ebcfcdbc0835b0d3204057892' 
  AND token = 'PKWAppIjS2vfMWs9p3E+A6nTyOJHEiYaePpHhEAxCHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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