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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cdcf50c2fae688e0d5c784365696c650ba9f6c0fecfd7c7104b4f22c08291dd' 
  AND token = 'iTaBjuCyjkktaH0kwgWSPMcY0P9VDbYDwbiJ+/8i2A0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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