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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb44536727dc36a4f9c5f98451ba7e04cc5a93b9605b00ad01ce3389903392e0' 
  AND token = 'aWoFEnOR7mVW+Y3d7LHUvAYiqxYA4we8dkiSc+R9w10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00132

JSON explain

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