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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '478e51ea12c67760c29e461339882029bf2ff66be0a917ef359d97f8e33241a0' 
  AND token = 'toYEL+DfVc8hbnesPMGlivy2eD/VflkRk7BkNG8AH54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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