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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20cb0269f452b09eb76c4281fc5f60cf48119a3577546fddced3ee99c52f3d31' 
  AND token = 'xrYONcs6t/S7Eu7V9mzHRuB0h9M9aw3hv2CTjROKsq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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