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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a8b00092d798fa3ef9b501bf1c44602a8b6c518552ef0a6009ae4d48fcc2515' 
  AND token = 'evMBATwbDxOUUT/KWVvOv0A4ng67fuLsYAZC/lDoXp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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