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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbb0b1d9504353c842f39935be5506ac98b80665497fe3eef543911f4aa5c831' 
  AND token = '4luFhFP0D0LLvYThnVMpsZ1yV8N5JmnoCU7ToDAPIrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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